Hi Everyone, Am using Apache Druid 0.22.0 which is deployed in single server [running using start-single-server-medium configuration] It has about 12 datasources and 5 kafka ingestion task. Everything was went fine. All of sudden yesterday "historical" service went down and no data-source available to query. While cross check I noticed so many logs of hs_err_pid198860.log in which it says out-of-memory issue (JVM heap-memory) But when I look @ the server resource availability CPU and Memory [ it has good enough available memory ] I tried to remove the segment-caching and removed some logs and re-started the service it started all the services including "historical" but with 5 min's time again noticed so many logs of hs_err_pid198860.log and historical service went down. But other services are in up state. How to resolve this issue ?

Wondering if you have more segments than your

max_map_count

setting https://druid.apache.org/docs/latest/operations/basic-cluster-tuning#max_map_count

ok, thank for the feedback.